Samuel pickering



(No Model.) n f S. 81: W. PICKERIN-G8v J. E. NORTON.

' 13003015150K AND SPRING. 8 No. 385,958. l PatentedJllly 10, 1888.

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NTTED STATES SAMUEL PICKERING, VILLIAM PICKERING, AND JOHN EDVIN tries.

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OLDHAB'I, COUNTY OF LANCASTER, ENGLAND; SAID SAMUEL vvPICKERING AND YVILLIAM PICKERING ASSIGNORS TO JAMES HINDLE AND FRANCIS HINDLE, BOTH OF SAME PLACE.

oooR CHECK AND SPRING.

SPECIFICATION forming part oi' Letters Patent No. 385,958, dated July 10, 1888. Application filed February IG, 1887. Serial No. 927,802. (No model.) Patented in England Decemherl, li, No. 14,731.

To all whoml it may concern:

Beit known that we, SAMUEL PIGKERING, WILLIAM PIc1 nmNG,and JOHN EDWIN NoR- TON, subjects of the Queen of Great Britain,

5 vresiding at Oldham, in the county of Lancaster, England, have invented an Improved- Door Check and Spring, (for which we have obtained a British patent, No. 14,731, dated December 1, 1885,) of which the following is 1o a specification.

This invention relates to that class of doorsprings which consist ofa swinging air-cylinder provided with a spring-piston.

Our object has been to construct a doubleaction spring which shall act silently,` close the door gently, and not allowit to swing violently to and fro until the spring stops, but to stop it as soon as it is closed and hold it steadily in this closed position against the action ofthe 2o highest wind, and thus our apparatus is esy peeially applicable to 'heavy swing-doors for publie buildings, hotels, and other places. It is also so constructed that it 'can be examined, adjusted, and repaired without disturbing the flooring or cement in which the casing is fixed.

In .order that our invention may be clearly understood, we have annexed hereto a sheet of drawings, and have marked the same with gures and letters of reference corresponding 3o with tlrose in the following explanation thereof.

Figure l is a plan vi-ew of our improved' doorcheck with the top plate removed. Fig. 2 is'a horizontal' section; Fig. 3, a longitudinal section; and Fig. 4, a transverse section through about the line AB on Fig. 1, and showing the position of the cam, hereinafter described, when the door is opened and the cylinder and spring-piston have assumed the position shown by dotted lines-on Fig. 1.

a is the casing of the apparatus; b and b', the top plates or covers thereof. c is the swinging cylinder,and piston.

The door is formed with a squared recess to receive the square end e of a vertical pivot, e', upon which is cast or otherwise fixed a anrplate, ff. j The cam-plate ff is attached to the spindle d d the springm m is the spring which closes the door.

-spring m m.

d' of the spring-piston d by the ff swings upon a hinge, h h, attached to or forming part of one end of the casinga a. The cam-plate ff is provided beneath with a circular or annular double incline, '17 i, (see Figs. 3 and 4,) and the casing a a is so formed or fitted as to contain two spring-catches, k It, or bolts immediately'v beneath and bearing up against the said incline, -so that lwhen the door is in its closed position (see Figs. l, 2, and 3) itis held there by these catches or bolts k k springing up into the notches i' i: of the double incline z' t'.-

The pistou d d is provided with a small air# valve, fr, of suitable construction, so that when the door is opened and the cam pulls the piston' up the cylinder c c, as shown dotted at Fig. 1, the air can escape through the valve, which, however, closes again when' the cylinder returns, and the air is forced through an outlet airva1ve, Z Z, of ordinary. construction, placed at or ucar the end cc'of the cylinder c c. The rapidity of the return movement of the doo'r is regulated by adjusting the -valve to allow the air to escape more or less quickly. The casing a a is let into the ooring or cernent,so that the covers'b b are flush with-the surface. The part I; ofthe cover closes over the cam and the pivot of the door. The part b may be mountedon hinges, so that the cylinder andv Working parts can' be readily, inspected, adjusted, or repaired when required. I

Tile action of the apparatus is as follows: When the door is pushed open, the cam-plate ffovercomes the pressure of the spring-bolts It lc and revolves with the pulling the spindle d and the piston d w\ith it' and swinging the cylinder c c either to the right or to the left. This compresses the The door can be opened until a projeetion,u,on the cam-plate ff comes against a suitable stop, as at o o, on the cross-plate pp. When the door is released, the spring m ln1. expands and forces the piston d d back into the cylinder c. The air, however, between the said pistou d d and the end c'of the cylinder pin gp, forming a pivotal joint, and the end of the cylinder c c'farthest from the cam-plate 5o action of the door,

hold the door in the closed position,

, swing either to the right or to door-spring is a double-acting one-that is to "say, the door` can be opened either inward or connected to the door.

` We claim as our invention 1. The combination of a door, a swinging air-cylinder, and a spring-piston therein with a cani connected to the door and having inclines and notches and spring catches orlbolts, substantially as set forth.

2. The combination of a spring-piston and swinging air-cylinder with a cam provided with lafprojection and a fixed stop to limit the action or opening of the door, substantially as set forth.

In testimony whereof we have signed our names to this specification in the presence `of 3 5 two subscribing witnesses.

YSAMUEL PICKERING.y 'WILLTAM PIcKnmNG. JOHN EDWIN NORTON..

forms a cushion and prevents the door from closing too violently. As the air escapes through thevalve Z l, the piston gradually returns in the cylinder` and pulls back the spindle and the cam, and consequently slowly closes the door. The cylinder resumes its central position, and the spring-bolts k 7c will then resisting the side pressure ol` any ordinary wind that may blow against it.

It is evident that as the cylinder c c can the left and the f f is double the incline on the cam-plate outward.

We are aware that door-checks have heretofore been let into the floor so as to be entirely out of sight and to let the door swingin either direction, and that a pivoted air-cylinder has been used with a piston operated from a plate 

